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The crankshaft will turn at the same speed on both engines. That is your reference point on any engine. Now you found the crank pulleys appear the same in size, it is the camshaft you have to worry about now and the ratio it is driven by the crank.
Also another issue it is likely to be the timing belt and water pump. I assume you want to use the 1108 belt. But, since the teeth are different, is a 1108 pump gonna fit on a 1368 block? is the belt long enough (the blocks I assume have different heights)?
If the answer is no, you could try the other way around. Keep the 1368 pump and crank pulley. but, are the camshaft pulleys the same size? Will a 1368 cam pulley fit on a 8V camshaft? and will a 1368 belt tension properly in these circumstances?
Loads of questions, not many answers, I know
You sir are a pain in the cheeks! Thank you for giving me something else to be paranoid about.
Lucky the head didn't sell. I'll get the tape measure out when I get home from work. Although it shouldn't matter because the gear ratio of the 16V head is determined more by the interconnecting gears that drives both cam's than the main cam' pulley itself. I think they'll be the same because it would be less cost effective for Fiat to have different sized wheels. Worst case scenario I'll have to keep the 16v cam wheel just in case.